610.8, Size of Meter and Building Supply Pipe Using Table 610.4, is hereby deleted in its entirety and the following provisions shall be substituted therefor:

The size of the meter and the building supply pipe shall be determined as follows:

(1) Determine the available pressure at the water meter or other source of supply.

(2) Subtract one-half (1/2) pound per square inch pressure (3.4 kPa) for each foot (305 mm) of difference in elevation between such source of supply and the highest water supply outlet in the building or on the premises.

(3) Use the “pressure range” group within which this pressure will fall using Table 610.4.

(4) Select the “length” column that is equal to or longer than the required length.

(5) Follow down the column to a fixture unit value equal to or greater than the total number of fixture units required by the installation.

(6) Having located the proper fixture unit valve for the required length, sizes of meter and building supply pipe as found in the two left-hand columns shall be applied.

No building supply pipe shall be less than three-quarter (3/4) inch (20 mm) in diameter; provided, however, in residential remodeling a maximum of twenty-eight (28) fixture units shall be allowed to be connected to an existing three-quarter (3/4) inch (20 mm) water service. Houses or apartments that are one thousand (1,000) square feet in area or larger shall have a minimum one (1) inch (25 mm) water meter and service line.